/
cert.go
87 lines (75 loc) · 2.09 KB
/
cert.go
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// Copyright (c) 2016 Niklas Wolber
// This file is licensed under the MIT license.
// See the LICENSE file for more information.
package job
import (
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"io/ioutil"
"strings"
errs "github.com/pkg/errors"
)
const (
pemBlockPrivateKey = "PRIVATE KEY"
)
func readPrivateKeyFile(keyFile string, password []byte) (crypto.Signer, []byte, error) {
b, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, []byte{}, errs.Wrap(err, "failed to read file")
}
block, err := parsePEMBlock(b, pemBlockPrivateKey, password)
if err != nil {
return nil, []byte{}, errs.Wrapf(err, "failed to parse PEM block %s", pemBlockPrivateKey)
}
key, err := parsePrivateKey(block.Bytes)
if err != nil {
return nil, []byte{}, errs.Wrap(err, "failed to parse private key")
}
switch k := key.(type) {
case crypto.Signer:
return k, block.Bytes, nil
default:
return nil, []byte{}, errs.New("private key is no valid crypto.Signer")
}
}
func parsePEMBlock(pemBlock []byte, typ string, password []byte) (*pem.Block, error) {
var keyDERBlock *pem.Block
for {
keyDERBlock, pemBlock = pem.Decode(pemBlock)
if keyDERBlock == nil {
return nil, errs.New("can't read PEM block")
}
if x509.IsEncryptedPEMBlock(keyDERBlock) {
out, err := x509.DecryptPEMBlock(keyDERBlock, password)
if err != nil {
return nil, errs.Wrap(err, "failed to decrypt PEM block")
}
keyDERBlock.Bytes = out
break
}
if keyDERBlock.Type == typ || strings.HasSuffix(keyDERBlock.Type, " "+typ) {
break
}
}
return keyDERBlock, nil
}
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey:
return key, nil
default:
return nil, errs.New("found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, errs.New("failed to parse private key")
}